/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkSeedRepresentation.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkSeedRepresentation.h"

#include "vtkActor2D.h"
#include "vtkCoordinate.h"
#include "vtkHandleRepresentation.h"
#include "vtkInteractorObserver.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPolyDataMapper2D.h"
#include "vtkProperty2D.h"
#include "vtkRenderer.h"
#include "vtkTextProperty.h"
#include <iterator>
#include <list>

vtkStandardNewMacro(vtkSeedRepresentation);

vtkCxxSetObjectMacro(vtkSeedRepresentation,HandleRepresentation,vtkHandleRepresentation);

// The vtkHandleList is a PIMPLed list<T>.
class vtkHandleList : public std::list<vtkHandleRepresentation*> {};
typedef std::list<vtkHandleRepresentation*>::iterator vtkHandleListIterator;


//----------------------------------------------------------------------
vtkSeedRepresentation::vtkSeedRepresentation()
{
  this->HandleRepresentation  = nullptr;

  // The representation for the seed handles
  this->Handles = new vtkHandleList;
  this->ActiveHandle = -1;

  this->Tolerance = 5;
}

//----------------------------------------------------------------------
vtkSeedRepresentation::~vtkSeedRepresentation()
{
  if ( this->HandleRepresentation )
  {
    this->HandleRepresentation->Delete();
  }

  // Loop over all handles releasing their observes and deleting them
  vtkHandleListIterator iter;
  for ( iter = this->Handles->begin(); iter != this->Handles->end(); ++iter )
  {
    (*iter)->Delete();
  }
  delete this->Handles;
}

//----------------------------------------------------------------------
vtkHandleRepresentation *vtkSeedRepresentation
::GetHandleRepresentation(unsigned int num)
{
  if ( num < this->Handles->size() )
  {
    vtkHandleListIterator iter = this->Handles->begin();
    std::advance(iter,num);
    return (*iter);
  }
  else //create one
  {
    if (this->HandleRepresentation == nullptr)
    {
      vtkErrorMacro("GetHandleRepresentation " << num << ", no handle representation has been set yet, cannot create a new handle.");
      return nullptr;
    }
    vtkHandleRepresentation *rep = this->HandleRepresentation->NewInstance();
    rep->DeepCopy(this->HandleRepresentation);
    this->Handles->push_back( rep );
    return rep;
  }
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::GetSeedWorldPosition(unsigned int seedNum, double pos[3])
{
  if ( seedNum >= this->Handles->size() )
  {
    vtkErrorMacro("Trying to access non-existent handle");
    return;
  }
  vtkHandleListIterator iter = this->Handles->begin();
  std::advance(iter,seedNum);
  (*iter)->GetWorldPosition(pos);
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::SetSeedDisplayPosition(unsigned int seedNum, double pos[3])
{
  if ( seedNum >= this->Handles->size() )
  {
    vtkErrorMacro("Trying to access non-existent handle");
    return;
  }
  vtkHandleListIterator iter = this->Handles->begin();
  std::advance(iter,seedNum);
  (*iter)->SetDisplayPosition(pos);
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::GetSeedDisplayPosition(unsigned int seedNum, double pos[3])
{
  if ( seedNum >= this->Handles->size() )
  {
    vtkErrorMacro("Trying to access non-existent handle");
    return;
  }
  vtkHandleListIterator iter = this->Handles->begin();
  std::advance(iter,seedNum);
  (*iter)->GetDisplayPosition(pos);
}

//----------------------------------------------------------------------
int vtkSeedRepresentation::GetNumberOfSeeds()
{
  return static_cast<int>(this->Handles->size());
}

//----------------------------------------------------------------------
int vtkSeedRepresentation::
ComputeInteractionState(int vtkNotUsed(X), int vtkNotUsed(Y), int vtkNotUsed(modify))
{
  // Loop over all the seeds to see if the point is close to any of them.
  int i;
  vtkHandleListIterator iter;
  for ( i = 0, iter = this->Handles->begin(); iter != this->Handles->end(); ++iter, ++i )
  {
    if ( *iter != nullptr )
    {
      if ( (*iter)->GetInteractionState() != vtkHandleRepresentation::Outside )
      {
        this->ActiveHandle = i;
        this->InteractionState = vtkSeedRepresentation::NearSeed;
        return this->InteractionState;
      }
    }
  }

  // Nothing found, so it's outside
  this->InteractionState = vtkSeedRepresentation::Outside;
  return this->InteractionState;
}

//----------------------------------------------------------------------
int vtkSeedRepresentation::GetActiveHandle()
{
  return this->ActiveHandle;
}

//----------------------------------------------------------------------
int vtkSeedRepresentation::CreateHandle(double e[2])
{
  double pos[3];
  pos[0] = e[0];
  pos[1] = e[1];
  pos[2] = 0.0;

  vtkHandleRepresentation *rep = this->GetHandleRepresentation(
    static_cast<int>(this->Handles->size()));
  if (rep == nullptr)
  {
    vtkErrorMacro("CreateHandle: no handle representation set yet! Cannot create a new handle.");
    return -1;
  }
  rep->SetDisplayPosition(pos);
  rep->SetTolerance(this->Tolerance); //needed to ensure that picking is consistent
  this->ActiveHandle = static_cast<int>(this->Handles->size()) - 1;
  return this->ActiveHandle;
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::RemoveLastHandle()
{
  if ( this->Handles->empty() )
  {
    return;
  }

  // Delete last handle
  this->Handles->back()->Delete();
  this->Handles->pop_back();
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::RemoveHandle( int n )
{
  // Remove nth handle

  if (n == this->ActiveHandle)
  {
    this->RemoveActiveHandle();
    return;
  }

  if (static_cast<int>(this->Handles->size()) <= n )
  {
    return;
  }

  vtkHandleListIterator iter = this->Handles->begin();
  std::advance( iter, n );
  vtkHandleRepresentation *hr = *iter;
  this->Handles->erase( iter );
  hr->Delete();
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::RemoveActiveHandle()
{
  if ( this->Handles->empty() )
  {
    return;
  }
  if ( this->ActiveHandle >= 0 && this->ActiveHandle < static_cast<int>(this->Handles->size()) )
  {
    vtkHandleListIterator iter = this->Handles->begin();
    std::advance( iter, this->ActiveHandle );
    vtkHandleRepresentation *hr = *iter;
    this->Handles->erase( iter );
    hr->Delete();
    this->ActiveHandle = -1;
  }
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::BuildRepresentation()
{
  if ( this->ActiveHandle >=0 && this->ActiveHandle < static_cast<int>(this->Handles->size()) )
  {
    vtkHandleRepresentation *rep = this->GetHandleRepresentation(this->ActiveHandle);
    if ( rep )
    {
      rep->BuildRepresentation();
    }
  }
}

//----------------------------------------------------------------------
void vtkSeedRepresentation::PrintSelf(ostream& os, vtkIndent indent)
{
  //Superclass typedef defined in vtkTypeMacro() found in vtkSetGet.h
  this->Superclass::PrintSelf(os,indent);

  os << indent << "Tolerance: " << this->Tolerance <<"\n";
  os << indent << "Number of Seeds: " << this->GetNumberOfSeeds() <<"\n";
}